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Showing content from https://webplatform.github.io/docs/javascript/Error/prototype below:

prototype · WebPlatform Docs

Returns a reference to the prototype for an error.

error.prototype

For example, to add a method to the Error object that returns the value of the largest element of the array, declare the function, add it to Error.prototype , and then use it.

function getSeverity(){
     if (this.number > 1000)
         return "high";
     else
         return "low";
 }
 Error.prototype.getSev = getSeverity;
 var myError = new Error();
 myError.number = 5000;

 document.write(myError.getSev());

 

The error argument is the name of an error.

Use the prototype property to provide a base set of functionality to an Error. New instances of an object “inherit” the behavior of the prototype assigned to that object.

All intrinsic JavaScript objects have a prototype property that is read-only. Properties and methods may be added to the prototype, but the object may not be assigned a different prototype. However, user-defined objects may be assigned a new prototype.

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